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\frac{2}{\left(x-2\right)\left(x+2\right)x^{2}}-\frac{1}{\left(x-2\right)\left(x-1\right)\left(x+2\right)}
Aïlleu la x^{4}-4x^{2}. Aïlleu la x^{3}-x^{2}-4x+4.
\frac{2\left(x-1\right)}{\left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}}-\frac{x^{2}}{\left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}}
Per afegir o restar les expressions, amplieu-les perquè els denominadors coincideixin. El mínim comú múltiple de \left(x-2\right)\left(x+2\right)x^{2} i \left(x-2\right)\left(x-1\right)\left(x+2\right) és \left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}. Multipliqueu \frac{2}{\left(x-2\right)\left(x+2\right)x^{2}} per \frac{x-1}{x-1}. Multipliqueu \frac{1}{\left(x-2\right)\left(x-1\right)\left(x+2\right)} per \frac{x^{2}}{x^{2}}.
\frac{2\left(x-1\right)-x^{2}}{\left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}}
Com que \frac{2\left(x-1\right)}{\left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}} i \frac{x^{2}}{\left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}} tenen el mateix denominador, resteu-los mitjançant la subtracció dels seus numeradors.
\frac{2x-2-x^{2}}{\left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}}
Feu les multiplicacions a 2\left(x-1\right)-x^{2}.
\frac{2x-2-x^{2}}{x^{5}-x^{4}-4x^{3}+4x^{2}}
Expandiu \left(x-2\right)\left(x-1\right)\left(x+2\right)x^{2}.